The invention relates to a backpack device comprising a framework, a storage rack, straps, a back cushion, a cushion and a lifter, wherein the straps and fixing belts are sleeved at two sides of the framework, movable handrails and positioners are fixed at two sides of the framework, a detachable head part fixing rack and a neck cushion are fixed over the middle part of the framework, the back cushion is fixed in the middle of the framework, the positioners and the rotatable storage rack are connected under the framework, the cushion and a support frame are fixed on one surface of the storage rack, the other surface of the storage rack is provided with a rotatable extended storage rack, and when the framework is divided into an upper part and a lower part, the lifter is fixed on the lower framework. Through the optimization design, when the storage rack faces goods, people can walk by backing the goods through the backpack device; and when the storage rack faces people, the backpack device is provided with the cushion, the back cushion, the handrails and the head part fixing rack, people can sleep well and the spine of the people can be protected well by fixing the body by the fixing belts, and the spine of the people can be protected better by using the lifter.